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Current content: 158 081 232 patent documents

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1 259 676 documents amended

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EP 0332741 B1 19910918 - MULTISTAGE VACUUM PUMP

Title (en)

MULTISTAGE VACUUM PUMP

Publication

EP 0332741 B1 19910918 (DE)

Application

EP 88117706 A 19881025

Priority

EP 88102986 A 19880229

Abstract (en)

[origin: EP0332741A1] The invention relates to a multistage vacuum pump (1) with a housing with a minimum of two expansion chambers (11, 12, 13) in the housing and with a minimum of one duct (52) joining the expansion chambers to one another; in order to be able to detect contamination in the particularly susceptible connecting ducts by simple means it is proposed to design this as part of a bore hole (55) leading to the outside which can be closed by means of a plug (59). <IMAGE>

IPC 1-7

F04C 23/00; F04C 29/00

IPC 8 full level

F04C 23/00 (2006.01); F04C 29/00 (2006.01)

CPC (source: EP)

F04C 23/001 (2013.01); F04C 29/0092 (2013.01)

Citation (examination)

DE 2158866 A1 19730530 - ENGSTFELD WILH FA

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 0332741 A1 19890920; EP 0332741 B1 19910918; DE 3865009 D1 19911024

DOCDB simple family (application)

EP 88117706 A 19881025; DE 3865009 T 19881025